Jul 17

Jul 17 - Jul 19

2026 Stock Outboard Nationals - ...

SO;N-J CLSES

Lake Neatahwanta

Fulton, NY

Jul 18

Jul 18 - Jul 19

Rumble in the Hills

INB

Rocky Fork State Park

Hillsboro, OH

Jul 18 - Jul 19

Northland Mardi Gras Gran Prix

OPC

Flambeau River

Ladysmith, WI

Jul 23

Jul 23 - Jul 26

2026 APBA Modified / Junior Nati...

MOD;N-J CLSES

Saint Joseph River

Constantine, MI

Jul 24

Jul 24 - Jul 26

Apollo Columbia Cup

VINTAGE-INB-UNL

McNary Pool, Columbia River

Kennewick, WA

Jul 25

Jul 25 - Jul 26

Leonardtown Bash on the Bay

VINTAGE

Breton Bay

Leonardtown, MD

Jul 25 - Jul 26

Frank Lara Tribute Race

OB RR

Klamath River

Klamath, CA

Jul 25 - Jul 26

ASBR Pro Racing Series Race #3

JET SPRI

Extreme Sports Park

Port Angeles, WA

Jul 25 - Jul 26

Serpent Lake Powerboat Races

OPC

Serpent Lake

Crosby, MN

Jul 30

Jul 30 - Aug 2

2026 APBA/USTS PRO NATIONAL CHAM...

PRO;W

Lake DePue

DePue,IL, IL

Jul 31

Jul 31 - Aug 2

Seafair Hydroplane Race

VINTAGE-INB-UNL-J CLSES

Lake Washington

Seattle, WA

Aug 1

Aug 1 - Aug 2

Xinsurance Great Lakes Grand Pri...

OS;N

Lake Michigan

Michigan City, IN

Aug 1 - Aug 2

Thunder on the Niagara

INB

Niagara River

North Tonawanda, NY

Aug 8

Aug 8 - Aug 9

TCPBA Chetek Watermania VI

OPC

Lake Chetek

Chetek, WI

Aug 8 - Aug 9

Top O Michigan Marathon National...

SO;N-J CLSES

Inland Waterway

Indian River, MI

Aug 8 - Aug 9

Leo Fry Memorial

OB RR

Rogue River

Agness, OR

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Modified Outboard Menu

Modified Outboard

Modified-Outboard

MOD racers aren't afraid to get their hands dirty - The goal in this category is to pull every last bit of horsepower out of your engine. In Modified Outboard, the engine builder's skill is just as important as the driver's. These boats are easily recognizable by their specially tuned pipes that make them as loud as they are fast. Because engines are constantly being modified to make the absolute most of what the rules allow, the competition is always fierce. Join the ranks of some of the best engine builders in the world, join Modified Outboard Racing.

Whether hydroplane or runabout, Modified classes are defined by the size of their engines (displacement). The numbers in the class names give you the approximate engine size in cubic centimeters. The 250ccMH, or 250 cubic centimeter Mod Hydro, is smaller than the 850ccMH, or 850 cubic centimeter Mod Hydro. Some classes have minimum weights, which increase with engine size. The smaller classes are often a good fit for younger, lighter drivers (14-year-olds may drive 200-250cc Mod classes, for example). The larger classes take considerable skill and experience. Propellers of four blades or less are used, and your prop choice can affect your speed enormously.

Modified Outboard Resources

Modified Outboard Classes